286 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



to let the water out by drops ; it is to be filled with water 

 and made fast to the prime conductor ; on turning the ma- 

 chine, the water, which before descended from the spout in 

 small drops only, will fly from it in a stream, which in the 

 dark appears like a stream of fire ; or a sponge saturated 

 with water may be suspended from the prime conductor, 

 when the same phenomenon will be observed, which is re- 

 ferable to the mutual repulsive property of similar electrified 

 particles. 



Suspend one pail from a positive conductor, and another 

 from a negative conductor, so that the ends of the jets may 

 be about three or four inches from each other. The stream 

 proceeding from one will be attracted by that which issues 

 from the other, and form one stream, which will be lumi- 

 nous in the dark. 



Hang two pails about four inches apart on the same con- 

 ductor, and the streams which issue from them will recede 

 from each other. Price, $0.75 and $1.50. 



F5 &- m _ The Phosphorus Cup. 



Fig. 323 represents two 

 hollow brass balls, about 

 three quarters of an inch 

 in diameter, insulated on 

 separate glass pillars, by 

 which they are supported 

 at a distance of about two 

 inches from eash other ; 

 the upper part of each ball 

 is hollowed into a cup into 

 which a small piece of phosphorus is to be put. A small 

 candle has its flame situated midway between the balls, one 

 of which is connected with the positive, and the other with 

 the negative conductor of a powerful machine. When the 

 balls are electrified, the flame is agitated, and, inclining 

 towards the one which is negative, soon heats insufficiently 

 to set fire to the phosphorus it contains, whilst the positive 

 ball remains perfectly cold, and its phosphorus unmelted. 

 On reversing the connexions of the balls with the machine, 

 the phosphorus in the other ball will now be heated, and 

 will inflame. Price, $3.50. 



